. >> president obama referred to one of his quotes today as he paid tribute to the late leader. >> as he once said, i'm not a saint unless you think of a saint as a sinner who keeps on trying. >> to see more of mandela's memorable quotes on wusa9.com, that's where we have more reaction from around the world and a place to submit your photos and videos of the late leader. >>> there's a lot more news to get to. we press on to it. tonight we are learning more about the american teacher shot to death in benghazi, libya. he was ronnie smith from texas. he was out taking his morning jog. when he left, he made a video for his church, and he said he was worried ability adapting to a foreign culture but expected his faith to sustain it. >> if there's any single person in the entire universe you can take a chance on, it's god. no matter what happens, i'm going, and that gives me peace, and i'm okay with that. >> smith was teaching chemistry at the international school in benghazi, and during his morning jog today, gunmen in a jeep pulled up, opened fire, and sped away. no one claimed responsibi